tg01on = new Image();
	tg01on.src = "images/bt_tga_on.gif";
	tg01off = new Image();
	tg01off.src = "images/bt_tga.gif";

	tg02on = new Image();
	tg02on.src = "images/bt_tgm_on.gif";
	tg02off = new Image();
	tg02off.src = "images/bt_tgm.gif";

	tg03on = new Image();
	tg03on.src = "images/bt_tgl_on.gif";
	tg03off = new Image();
	tg03off.src = "images/bt_tgl.gif";


function imgAct (imgName) {
   document[imgName].src = eval(imgName + "on.src");
}

function imgInact(imgName) {
   document[imgName].src = eval(imgName + "off.src");
}